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Java Articles
Page 205 of 450
Java program to check if a string is a valid number
In Java, verifying whether a string is a valid number is a common requirement in various applications. This process ensures that the string can be safely converted to a numerical type without causing runtime exceptions. To validate if a string can be converted to these types, we use the Integer.parseInt() and Float.parseFloat() methods, respectively. Problem Statement Given a string that may contain an integer or a float value, write a Java program to check whether it is valid number or not. Input "100" //string value Output 100 // ...
Read MoreJava Connection setTransactionIsolation() method with example
In a database system, where more than one transaction is being executed simultaneously and in parallel, the property of isolation states that all the transactions will be carried out and executed as if it is the only transaction in the system. No transaction will affect the existence of any other transaction. Transaction Isolation Levels in Java Connection JDBC (Java Database Connectivity) provides support 5 transaction isolation levels through Connection interface. TRANSACTION_NONE: It is represented by integer value 0 does not support transactions. TRANSACTION_READ_COMMITTED: It is represented by integer value 2 supports ...
Read MoreJava Program to Find Common Elements in Two ArrayList
In this article, we will learn how to find common elements in two array-list. The ArrayList class extends AbstractList and implements the List interface. ArrayList supports dynamic arraysthat can grow as needed. Problem Statement In the given array, we aim to find the common elements in two ArrayList objects in Java, array lists are created with an initial size. When this size is exceeded, the collection is automatically enlarged. When objects are removed, the array may be shrunk. Below is a demonstration of the same − Input − First list: [Java, Scala, Shell, JavaScript] Second list: [Java, Python, Shell] Output ...
Read MoreJava Program for Binary Insertion Sort
Binary insertion sort uses the binary search to find the right position to insert an element at a specific index at every iteration. First, the location where the element needs to be inserted is found. Then, the elements are shifted to the next right location. Now, the specific element is placed in the position. Problem Statement Given an integer of array implement binary insertion sort using Java to sort it. The algorithm should use binary search to determine the correct position for each element and to maintain the sorted order it will shift elements accordingly. Steps for Binary Insertion ...
Read MoreJava program to double the size of an array
In this article, we will learn how to double the size of an array in Java. This involves creating a new array with twice the length of the original array and copying the elements from the original array to the new, larger array. Problem Statement Create an initial array with predefined integer values and determine its length. Then, create a new array with double the length of the original array, copy the elements from the original array to the new one, and print the lengths of both the original and the new arrays to verify the resizing operation. Steps to ...
Read MoreJava program to convert LocalDate to java.util.Date in UTC
In this article, we will learn how to convert a local date to a java.util.Date in UTC using Java's date and time API. Problem Statement Convert the current date, to a java.util.Date object in Coordinated Universal Time (UTC). The goal is to achieve this conversion while ensuring that the resulting java.util.Date object represents the start of the day in UTC for the given LocalDate. Steps to Convert LocalDate to java.util.Date in UTC The following are the steps to convert LocalDate to java.util.Date in UTC Step 1: Import the required classes i.e., java.time and java.util ...
Read MoreJava Program for Closest Prime Number
A prime number is a positive integer greater than 1 that is only divisible by 1 and itself. Prime numbers are an essential concept in mathematics and computer science. They are integers that are only divisible by 1 and themselves. Finding prime numbers is an important task in many algorithms, and there are several methods to determine if a number is prime. One such problem is finding the closest prime number to a given number. Problem Statement For a given number find the closest prime number by using Java programming language. Consider the following example - Input ...
Read MoreJava Program to Toss a Coin
Tossing a coin is flipping a coin into the air and letting it fall back down. When you toss a coin, it's like a game where you can choose heads or tails, and the side that lands facing up is the result. This method is used when we want to make decisions or settle things randomly. Problem Statement Create a Java program to simulate the flipping of a coin 10 times, recording the number of times the result is "heads" and "tails". Output Chances = 10 Heads: 3 Tails: 7 Algorithms Step-1: Create an instance of the "Toss" ...
Read MoreJava Program to Get the Union & Intersection of Two TreeSet
TreeSet is a class that implements Set interface in Java. In TreeSet the elements are stored in sorted order as it is implemented internally using a sorted balanced tree called as binary search tree. The elements in the TreeSet are stored in ascending order by default. Union of sets contains all the elements from both sets. Intersection of sets contain all the elements which are commonly present in both sets. In this section, we will be discussing about how to get the union and intersection of two TreeSet using Java. What are the Union and Intersection of Sets? ...
Read MoreJava Program to Get TreeMap Key, Value, or Entry Greater or Less than the Specified Value
A TreeMap is a class provided by Java that implements Map Interface. It is a collection of key-value pairs and the key-value pairs in TreeMap are stored in sorted order based on key values. An Entry is defined as a key-value pair in a TreeMap. In this article, we will look in detail how to get TreeMap key-value pair or entry greater or less than the specified value. Methods Used Now, we will be looking into some of the inbuilt methods and their functionality of TreeMap which are used in this particular article. higherKey() − This method is ...
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